package com.hm.common.su.util;

import lombok.extern.slf4j.Slf4j;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.UUID;

/**
 * @author shishun.wang
 * @version 1.0
 * @date 2018/8/31 11:33
 * @describe
 */
@Slf4j
public class Md5 {
    private Md5() {
    }

    private final static String[] strDigits = { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "a", "b", "c", "d", "e", "f" };

    private static String byteToArrayString(byte bByte) {
        int iRet = bByte;
        if (iRet < 0) {
            iRet += 256;
        }
        int iD1 = iRet / 16;
        int iD2 = iRet % 16;
        return strDigits[iD1] + strDigits[iD2];
    }

    private static String byteToString(byte[] bByte) {
        StringBuffer sBuffer = new StringBuffer();
        for (int i = 0; i < bByte.length; i++) {
            sBuffer.append(byteToArrayString(bByte[i]));
        }
        return sBuffer.toString();
    }

    public static String getMD5Code(String strObj) {
        String resultString = null;
        if (null != strObj) {
            try {
                resultString = new String(strObj);
                resultString = byteToString(MessageDigest.getInstance("MD5").digest(strObj.getBytes()));
                return resultString;
            } catch (NoSuchAlgorithmException e) {
                log.error(e.getMessage(), e);
            }
        }
        return UUID.randomUUID().toString();
    }
}
